In 2008, NASA reorganized in order to align itself with the new Vision for Space Exploration. The reorganization clarified organizational roles with the creation of four mission directorates: Aeronautics Research, Human Exploration and Operations, Science, and Space Technology. These Directorates manage the many missions NASA undertakes, and address the need for an integrated approach to science requirements, management and implementation of the missions. Each Mission Directorate now covers a major area of NASA’s research and development efforts.
The NASA budget for each of the directorates can be found under the NASA Budget tab.
Updated April 2018 by Rachel Werth